cdm: fix unsafe buffers in cenc_utils

This change removes all unsafe buffer uses in cenc_utils and their unit
tests. To do that, it:

* Migrates the cenc_utils functions from taking const vector<uint8_t>&
  to taking span<const uint8_t>
* Migrates all the test data from uint8_t[] to std::array<uint8_t>
* Removes a lot of now-unnecessary vector copies
* Includes cenc_utils_unittest.cc in builds with !proprietary_codecs -
  cenc_utils.cc is included in these builds, so the tests should be as
  well, and these tests don't depend on proprietary codecs.
* Since the test fixture for CencUtilsTest now has no state and does no
  setup, deletes the test fixture altogether and makes the tests
  fixtureless.

Bug: 383606739
Change-Id: Ib87c1dfd9764e9fe878bcdba3e3399fadc5d4e84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6088948
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Elly FJ <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1402747}
4 files changed
tree: d876256cde885a1cffacd30197b4030fa71b6903
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
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